基于H_∞模型匹配的应急飞行控制研究

Design of propulsion only emergency flight control system using H_∞ model matching

研究了当飞机常规操纵舵面失效时 ,通过调节飞机发动机推力大小来操纵飞机的飞行问题。采用 H∞ 模型匹配的方法 ,设计动态补偿器 ,使只调节发动机推力的飞机所表现的特性与在常规舵面操纵下的飞机所表现的特性相近似 ,从而使飞行员能在操纵舵面失效的情况下 ,按常规操纵的方法通过控制飞机发动机推力来操纵飞机 ,实现应急控制。仿真验证了这种方法的有效性。

In this paper, the concept of emergency flight control system which uses the engine throttle to manipulate the aircraft in case of control surface failure is discussed. A dynamic compensator is designed using H ∞ model matching technique, which is based on the matching in the H ∞ sense between the throttle actuated crippled aircraft and the nominal control surface actuated aircraft model. With the propulsion only emergency flight control system, the pilot can control the aircraft as with the normal control surface.The emergency longitudinal and lateral control system of Boeing720 is designed. Simulation results show that the concept is workable.